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J Infect Dis. 2005 Dec 1;192(11):1962-5. Epub 2005 Oct 20.

Parasitological rebound effect and emergence of pyrimethamine resistance in Plasmodium falciparum after single-dose sulfadoxine-pyrimethamine.

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  • 1Infection Epidemiology Group, Bernhard Nocht Institute for Tropical Medicine, Hamburg, Germany.

Erratum in

  • J Infect Dis. 2006 May 1;193(9):1340.


Intermittent preventive treatment for malaria in infants (IPTi) is a promising malaria control strategy. However, mass preventive treatment for malaria inherently bears the risk of increasing drug resistance. Here, the effect of single-dose sulfadoxine-pyrimethamine (S-P) versus placebo on Plasmodium falciparum infection rates was assessed in 63 selected infants who were aparasitemic at enrollment. An increase in the proportion of infants with isolates exhibiting drug resistance-associated mutations was detected 3 weeks after drug application in the treatment group. S-P, in the setting of IPTi, appears to cause a parasitological rebound effect in which there is selection of drug-resistant parasites for a short period after drug clearance.

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